sfeed.{1,5}: clarify the timestamp field a bit

In particular for RSS feeds where a pubDate is optional.

2 files changed, 2 insertions, 2 deletions

diff --git a/sfeed.1 b/sfeed.1
index 322e4e3..1500397 100644
--- a/sfeed.1
+++ b/sfeed.1
@@ -31,7 +31,7 @@ Control characters are removed.
 The order and content of the fields are:
 .Bl -tag -width 17n
 .It timestamp
-UNIX timestamp in UTC+0, empty on parse failure.
+UNIX timestamp in UTC+0, empty if missing or on parse failure.
 .It title
 Title text, HTML code in titles is ignored and is treated as plain-text.
 .It link
diff --git a/sfeed.5 b/sfeed.5
index ab28e53..071424e 100644
--- a/sfeed.5
+++ b/sfeed.5
@@ -25,7 +25,7 @@ Control characters are removed.
 The order and content of the fields are:
 .Bl -tag -width 17n
 .It timestamp
-UNIX timestamp in UTC+0, empty on parse failure.
+UNIX timestamp in UTC+0, empty if missing or on parse failure.
 .It title
 Title text, HTML code in titles is ignored and is treated as plain-text.
 .It link